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Date:   Wed, 15 Sep 2021 09:59:42 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Networking <netdev@...r.kernel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Quentin Monnet <quentin@...valent.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        David Miller <davem@...emloft.net>
Subject: Re: linux-next: build failure after merge of the bpf-next tree

Hi Andrii,

On Tue, 14 Sep 2021 16:40:37 -0700 Andrii Nakryiko <andrii.nakryiko@...il.com> wrote:
>
> On Tue, Sep 14, 2021 at 4:38 PM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> >
> > Hi Andrii,
> >
> > On Tue, 14 Sep 2021 16:25:55 -0700 Andrii Nakryiko <andrii.nakryiko@...il.com> wrote:  
> > >
> > > On Mon, Sep 13, 2021 at 6:37 PM Stephen Rothwell <sfr@...b.auug.org.au> wrote:  
> > > >
> > > > After merging the bpf-next tree, today's linux-next build (perf) failed
> > > > like this:
> > > >
> > > > util/bpf-event.c: In function 'btf__load_from_kernel_by_id':
> > > > util/bpf-event.c:27:8: error: 'btf__get_from_id' is deprecated: libbpf v0.6+: use btf__load_from_kernel_by_id instead [-Werror=deprecated-declarations]
> > > >    27 |        int err = btf__get_from_id(id, &btf);
> > > >       |        ^~~
> > > > In file included from util/bpf-event.c:5:
> > > > /home/sfr/next/next/tools/lib/bpf/btf.h:54:16: note: declared here
> > > >    54 | LIBBPF_API int btf__get_from_id(__u32 id, struct btf **btf);
> > > >       |                ^~~~~~~~~~~~~~~~
> > > > cc1: all warnings being treated as errors
> > > >
> > > > Caused by commit
> > > >
> > > >   0b46b7550560 ("libbpf: Add LIBBPF_DEPRECATED_SINCE macro for scheduling API deprecations")  
> > >
> > > Should be fixed by [0], when applied to perf tree. Thanks for reporting!
> > >
> > >   [0] https://patchwork.kernel.org/project/netdevbpf/patch/20210914170004.4185659-1-andrii@kernel.org/  
> >
> > That really needs to be applied to the bpf-next tree (presumably with
> > the appropriate Acks).
> >  
> 
> This is perf code that's not in bpf-next yet.

Then you need to think of a solution for the bpf-next tree, as it will
not build (allmodconfig) when combined with Linus' current tree.  And
when it is merged into the net-next tree, that tree will be broken as
well.

-- 
Cheers,
Stephen Rothwell

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